OPINION
¶ 1 The Tohono O’odham Nation (“Nation”) appeals the grant of summary judgment to the City of Glendale (“Glendale”) on Nation’s challenge to Glendale’s purported annexation of real property owned by Nation. For the reasons that follow, we hold that when the validity of a municipality’s annexation ordinance is timely challenged in court, the annexation does not automatically become final thirty days after the ordinance was adopted. Accordingly, we reverse the grant of summary judgment in favor of Glendale and re *114 mand for entry of judgment in favor of Nation.
BACKGROUND
¶ 2 On November 27, 2001, Glendale adopted Ordinance No. 2229 annexing certain property referred to as “Annexation Area 137.” On December 27, 2001, an owner of land within Area 137 timely filed a petition in superior court to set aside the annexation. See Ariz.Rev.Stat. (“A.R.S.”) § 9-471(C) (Supp. 2010). 1 On May 28, 2002, Glendale adopted an ordinance repealing Ordinance No. 2229 and thereby abandoned “the attempted annexation of ... Area No. 137.” 2 The court dismissed the annexation challenge from the inactive calendar on October 7, 2002. Nation subsequently purchased the parcel within Area 137 that was owned by the party who filed the 2001 annexation challenge.
¶ 3 On June 23, 2009, Glendale adopted Ordinance No. 2688, which deemed Glendale’s “interior boundary to have been extended and increased inclusive of the territory described as Annexation Area No. 137 as of December 27, 2001.” Ordinance No. 2688 also announced that because Glendale did not have the statutory authority to “abandon its annexation,” its attempt to repeal Ordinance No. 2229 in 2002 was “ineffective and a nullity.” 3
¶4 On July 22, 2009, Nation commenced this action, alleging Ordinance No. 2688 violated A.R.S. § 9-471, the statute that sets forth the procedures a city or town must follow when increasing its limits by annexation. Specifically, Nation argued that, because Ordinance No. 2229 was timely challenged and the annexation effort subsequently repealed by Glendale before the court addressed the merits of the challenge, the 2001 annexation never became final or effective. 4 See AR.S. § 9-471(D) (annexation becomes final thirty days after ordinance that annexes territory is adopted, subject to judicial review if an objection was filed).
¶ 5 Nation moved for summary judgment. Glendale opposed and filed a cross-motion for summary judgment. The parties did not dispute any material facts, and they agreed that summary disposition of the case hinged on the court’s interpretation of § 9-471(D). The court ultimately denied Nation’s motion and granted Glendale’s. This appeal was timely filed, and we have jurisdiction pursuant to A.R.S. § 12-210KB) (2003).
ANALYSIS
¶ 6 Subsections (C) and (D) of AR.S. § 9-471 provide, in relevant part:
C. Any ... interested party may upon verified petition move to question the validity of the annexation for failure to comply with this section [outlining procedures for instituting annexation proposal, notice of public hearing and map of area to be annexed] ... No action shall be brought to question the validity of an annexation ordinance unless brought within the time and for the reasons provided in this subsec-tion____
D. The annexation shall become final after the expiration of thirty days from the adoption of the ordinance annexing the territory by the city or town governing body, provided the annexation ordinance has been finally adopted in accordance with procedures established by statute, charter provisions or local ordinances, whichever is applicable, subject to the review of the court to determine the validity *115 thereof if petitions in objection have been filed.
(Emphases added.)
¶ 7 As it did below, Nation argues that, pursuant to § 9-471(D), a timely challenge to a city’s annexation ordinance delays the finality of the annexation until the court has completed its review of the challenge. The basis for Nation’s position is the language in subsection (D) providing that an annexation shall become final “subject to the review of the court to determine the validity thereof if petitions in objection have been filed.” A.R.S. § 9-471(D) (emphasis added). Thus, Nation argues, the 2001 annexation was never final because Ordinance No. 2229 was timely challenged on December 27, 2001 and Glendale repealed the annexation attempt in 2002 before the court ruled on the challenge. In response, Glendale argues, as it did in support of its cross motion for summary judgment, that the language in A.R.S. § 9-471 “[t]he annexation shall become final after the expiration of thirty days from the adoption of the ordinance annexing the territory []” (emphasis added) means that an annexation automatically becomes final thirty days after the annexation ordinance was adopted regardless of whether the ordinance is challenged before the thirty-day period expires. Thus, Glendale contends, although the 2001 challenge to Ordinance No. 2229 caused the annexation to be subject to judicial review, the challenge did not prevent the annexation from becoming final on December 27, 2001, thirty days after the ordinance was adopted. 5 No court opinion in Arizona squarely addresses whether § 9-471(D) renders municipal annexations final thirty days after they are adopted regardless of whether a challenge is timely filed. 6
¶ 8 We review
de novo
the superior court’s decision to grant summary judgment on statutory construction grounds.
See Copper Hills Enterprises,
¶ 9 We agree with Nation’s interpretation of A.R.S. § 9-471(D). The legislature’s use of the “subject to” clause in the statute unambiguously evidences an intent that the finality of a timely challenged annexation is conditional upon a court’s determination that the annexation is valid. Glendale’s argument that “[t]he only condition required for an annexation to become final is the passage of 30 days” improperly fails to give effect to the “subject to judicial review” condition that the legislature expressly included in the statute.
See Airport Properties v. Maricopa County,
¶ 10 In light of our holding, Ordinance No. 2229 did not become final before Glendale repealed it. Accordingly, Nation is entitled to summary judgment on its claim that Ordinance No. 2229 did not annex Area 137. Ariz. R. Civ. P. 56(c)(1) (summary judgment appropriate when moving party entitled to judgment as a matter of law). We therefore remand for entry of judgment in favor of Nation.
See Anderson v. Country Life Ins. Co.,
CONCLUSION
¶ 11 We reverse summary judgment in favor of Glendale and direct entry of judgment for Nation on remand. Pursuant to AR.S. § 9-471(P), we grant Nation’s request for attorneys’ fees and costs incurred on appeal subject to compliance with ARCAP 21.
Notes
. Unless a statute has been revised in a manner material to our analysis, we cite its current version.
. Glendale apparently abandoned the annexation because the pending challenge thereto would delay and possibly threaten development of parcels of Area No. 137 owned by supporters of the annexation. Glendale thereafter annexed the supporters’ parcels separately.
. ”[T]o the extent necessary,” Glendale also repealed the 2002 ordinance that had repealed Ordinance No. 2229.
. Nation also alleged Glendale did not follow the necessary statutory procedures before adopting Ordinance No. 2688, and therefore, Ordinance No. 2688 itself could not effectively annex Area 137.
. Accordingly, Glendale now claims its attempt in 2002 to repeal the finalized annexation was a "mistake of law” and ineffective. Because of our resolution of the central statutory issue, we need not address Glendale’s contention.
. The cases relied upon by the parties to support their respective positions are distinguishable.
See, e.g., Salt River Project Agrie. Improvement and Power Dist. v. City of St. Johns,
. Because we find the statute unambiguous on this point, we need not resort to additional tools of construction.
See Automatic Registering Mach. Co. v. Pima County,
